Energy efficiency of different technologies incorporating solar thermal energy for pasteurizing a viscous vegetable homogenate
Year: 2025
Type: article
Abstract: Thermal processing of foods can greatly benefit from using solar thermal energy technology, due to the relatively low temperatures required. Radiofrequency heating for pasteurization may also increase energy and thermal efficiency, as this technology can be powered by renewable electricity. This study analyzes the use of solar thermal energy in combination with conventional and radiofrequency technologies for the pasteurization of a viscous vegetable homogenate (salmorejo). Throughout 2022, productions of salmorejo were carried out in a pilot-scale processing plant located in Monells (Spain), and seasonal differences in energy consumption and solar fraction were analyzed. Results were compared to the performance of the system running on steam provided by an electric boiler. Results show that the integration of solar thermal energy brought about important reductions in electric energy consumption. In summer, solar fractions around 90% were obtained for both technologies. This represents a great opportunity for energy savings in seasonal products like salmorejo, which are mostly produced in summer. When compared to conventional pasteurization, radiofrequency pasteurization showed potential to maintain high solar fractions even during periods of low radiation, which could greatly reduce the carbon footprint of the whole process specially if the radiofrequency unit is powered by renewable electricity.
Source: Solar Energy
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,900
OpenAlex ID: W4411081594